diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 43d2756cf..94ab74021 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.2.0-6"
-export PIKA_PACKAGE_NAME="pytweening"
+export PIKA_PACKAGE_VERSION="4.0.5.3140.ds6-14"
+export PIKA_PACKAGE_NAME="firebird4.0"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"